@Siikalahna
Because it would ruin his relationship with them, not to mention they likely are stronger than the monsters themselves.
Why do a zero effort job that ruins your relationship with people when you can do another zero effort job that makes everybody like you?
There is literally no reason for him NOT to do this.
It will get him in their good book instantly and considering how strong he is, its hardly going to be difficult.
Also, I think you misunderstand why they are there.
They are there to save his ass if he really was one of those nobles who just let other people do the work for them.
They most likely aren't going to help him unless he is at risk of getting killed.